3Com 4500 - Mirroring

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Table of Contents
1 QoS Configuration·····································································································································1-1
Overview ·················································································································································1-1
Introduction to QoS··························································································································1-1
Traditional Packet Forwarding Service····························································································1-1
New Applications and New Requirements ······················································································1-1
Major Traffic Control Techniques ····································································································1-2
QoS Supported By Switch 4500 Series ··································································································1-3
Introduction to QoS Functions ················································································································1-3
Traffic Classification ························································································································1-3
Priority Trust Mode ··························································································································1-4
Protocol Priority ·······························································································································1-7
Priority Marking································································································································1-8
Traffic Policing ·································································································································1-8
Line Rate ·········································································································································1-9
VLAN Mapping ································································································································1-9
Queue Scheduling ···························································································································1-9
Congestion Avoidance···················································································································1-12
Traffic mirroring ·····························································································································1-13
QoS Configuration·································································································································1-13
Configuring Priority Trust Mode·····································································································1-13
Configuring the Mapping between 802.1p Priority and Local Precedence ···································1-14
Setting the Priority of Protocol Packets ·························································································1-15
Marking Packet Priority··················································································································1-16
Configuring Traffic Policing ···········································································································1-17
Configuring Line Rate····················································································································1-18
Configuring VLAN Mapping···········································································································1-19
Configuring Queue Scheduling ·····································································································1-19
Configuring WRED ························································································································1-21
Configuring Traffic Mirroring··········································································································1-22
Displaying and Maintaining QoS···········································································································1-23
QoS Configuration Examples················································································································1-24
Configuration Example of Traffic policing and Line Rate ······························································1-24
Configuration Example of Priority Marking and Queue Scheduling ··············································1-25
VLAN Mapping Configuration Example·························································································1-26